R=U/I so R= 7V/0.5A = 14 Ω
Now we just substract botg resistors from the total to get R3: 14 - 4 - 1= 9Ω
Angular velocity w is directly proportional to its velocity.
The correct answer is helium nucleus. An alpha particle has a two neutrons and protons that formed together into a particle which also happens to be very identical to the helium nucleus. However, the helium particles that are being produced by particle accelerator are less to be referred as an alpha particle.
<span>The correct option is D) both A and B. In fact, the strength of an electric field produced by a single point charge is given by
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where Q is the charge that generates the field, k is the Coulomb's constante and r is the distance from the charge source of the field.
From the equation, we see that the strength of the field depends on A) the amount of charge that produced the field (Q) and B) the distance from the charge (r), so the correct option is D.</span>
<span>When lava erupts from mid-ocean ridges, it cools rapidly into rock. As it does, it becomes magnetised permanently in the direction of the Earth's magnetic field.</span>